diff --git a/t4_devkit/evaluation/__init__.py b/t4_devkit/evaluation/__init__.py
index 461c4f5..c336c05 100644
--- a/t4_devkit/evaluation/__init__.py
+++ b/t4_devkit/evaluation/__init__.py
@@ -4,3 +4,4 @@
 from .matching import *  # noqa
 from .result import *  # noqa
 from .metric import *  # noqa
+from .task import *  # noqa
diff --git a/t4_devkit/evaluation/dataset.py b/t4_devkit/evaluation/dataset.py
index f721d0e..7fb4c39 100644
--- a/t4_devkit/evaluation/dataset.py
+++ b/t4_devkit/evaluation/dataset.py
@@ -7,6 +7,8 @@
 from t4_devkit import Tier4
 from t4_devkit.dataclass import HomogeneousMatrix, TransformBuffer
 
+from .task import EvaluationTask
+
 if TYPE_CHECKING:
     from t4_devkit.dataclass import BoxLike
     from t4_devkit.schema import EgoPose, Sensor
@@ -15,11 +17,12 @@
 __all__ = ["load_dataset", "FrameGroundTruth", "SceneGroundTruth"]
 
 
-def load_dataset(data_root: str) -> SceneGroundTruth:
+def load_dataset(data_root: str, task: EvaluationTask) -> SceneGroundTruth:
     """Load dataset.
 
     Args:
         data_root (str): Root directory path to the dataset.
+        task (EvaluationTask): Evaluation task.
 
     Returns:
         SceneGroundTruth: Loaded container of ground truths.
@@ -29,7 +32,11 @@ def load_dataset(data_root: str) -> SceneGroundTruth:
     frames: list[FrameGroundTruth] = []
     for i, sample in enumerate(t4.sample):
         # annotation boxes
-        boxes = list(map(t4.get_box3d, sample.ann_3ds))
+        boxes = (
+            list(map(t4.get_box3d, sample.ann_3ds))
+            if task.is_3d()
+            else list(map(t4.get_box2d, sample.ann_2ds))
+        )
 
         # transformation matrix from ego to map
         ego_pose = _closest_ego_pose(t4, sample.timestamp)
diff --git a/t4_devkit/evaluation/task.py b/t4_devkit/evaluation/task.py
new file mode 100644
index 0000000..b452e25
--- /dev/null
+++ b/t4_devkit/evaluation/task.py
@@ -0,0 +1,25 @@
+from __future__ import annotations
+
+from enum import Enum
+
+__all__ = ["EvaluationTask"]
+
+
+class EvaluationTask(str, Enum):
+    """Enumeration of evaluation tasks."""
+
+    DETECTION3D = "detection3d"
+    TRACKING3D = "tracking3d"
+    PREDICTION3D = "prediction3d"
+    DETECTION2D = "detection2d"
+    TRACKING2D = "tracking2d"
+
+    def is_3d(self) -> bool:
+        return self in (
+            EvaluationTask.DETECTION3D,
+            EvaluationTask.TRACKING3D,
+            EvaluationTask.PREDICTION3D,
+        )
+
+    def is_2d(self) -> bool:
+        return self in (EvaluationTask.DETECTION2D, EvaluationTask.TRACKING2D)
diff --git a/tests/evaluation/test_task.py b/tests/evaluation/test_task.py
new file mode 100644
index 0000000..638ed2b
--- /dev/null
+++ b/tests/evaluation/test_task.py
@@ -0,0 +1,14 @@
+from __future__ import annotations
+
+from t4_devkit.evaluation import EvaluationTask
+
+
+def test_task() -> None:
+    task_names = {"detection3d", "tracking3d", "prediction3d", "detection2d", "tracking2d"}
+
+    assert task_names == {e.value for e in EvaluationTask}
+
+    for name in task_names:
+        task = EvaluationTask(name)
+
+        assert task == name